Assig-nos



Jan. 29, 1929.

M. H. DAMERELL CENTER DRILLING MACHINE Filed May 29, 1926 2 Sheets-Sheet Jan. 29, 1929.

M. H. DAMERELL CENTER DRILLI NG MACHINE Filed May 29, 1926 2 Sheets-Sheet 2 im, M

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Patented Jan. 29, 1929.

UNITED STATES PATENT OFFICE.

MARK H. DAMERELL, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO WYMAN-GOR- DON COMPANY,` OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSA.-

CHUSETTS.

CENTER DRILLING MACHINE.

Application led May 29, 1926.

rlhis invention relates to a. machine for drilling centers in the ends of shafts, such as crank shafts.

After crank shafts or similar structures have been forged and before subsequent operations are performed thereon, center holes must be drilled in the ends thereof. This invention relates to a machine for performing this function quickly and accurately.

The general object of this invention is to provide a machine so constructed and arranged that when set into operation, the machine. will automatically advance the tool or drill into the work and thereafter withdraw the tool from the work after center drilling the same.

Another object of the invention is to provide a machine of the character described, so constructed that it will move the tool into the work a predetermined distance and then automatically withdraw the tool from the work. l

A still further object of the invention is to provide a machine of the character specilied so constructed that when set intooperation the machine will automatically complete its cycle and will accurately drill holes` of the desired depth in one or both ends of a shaft mounted therein.

Further objects of the invention will appear in the following specification, taken in connection with the, drawings which form a part ot' this application and in which Fie'. 1v is a longitudinal sectional view of the machine constructed in accordance with the inveiition:

Fie'. 2 is an enlarged section showing' the ,'alvc mechanism for controlling the operation of the tool;

Fig. 3 is a view similar to Fig. 2 but showincfurther elements of the valve mechanism and illustratingthe valves in a diiferent position of adjustment from that shown in Fig. S2 g Fig'. d is an end elevation of the lever mechanism for ol'ierating the slide valve;

Fig. 5 is an elevational view taken at right angles at Figi'. 3 and showing a portion of the valve mechanism; and

Fig. 6 is a sectional elevation of adjustingg` means tor the valve control rod.

The invention briefly described comprises a tool, such as a drill., mounted for rotation and also mounted for longitudinal movement ,slidably mounted in a support. 20.

Serial No. 112,670.

into and out of the work operated upon. In

Drill mounting.

Inthe particular form of the invention illustrated, the tool consistsof a rotary drill mounted on a support or base 10. The drill 1l is mounted in a collet 12 of the usual construction which has a threaded portion 13 threaded into the front end le. ot' an elongated spindle or rod l5. rlhe rod 15 has a hand wheel 1G secured in the rear end thereof and by rotating,l said hand wheel and rod, the collet l2 will be drawn into a chuck or holder 17. The collet 12 has a pin 12 positioned in a longitudinal internal groove 17 in the chuck 1T to prevent rotation of the collet when thc collet is drawn into the chuck. The chuck 17 has a conical outer surface 1S mounted to rotate in a bearinp` or sleeve 19 which is The sleeve 19 has rack teeth 2l which are engaged by a gear carried by a shaft 23 and the tool can be moved longitudinally by manually rotatinpA the shaft 2B. A nut Q-i is threaded on a rear end of the chuck 1T and a collar is interposed between the nut and bearing 19.

The holder or chuck 1T is extended rearwardlyVY in the form of a sleeve 30. |This sleeve is keyed to or splined to a sleeve 31 which mounted in ball bearings 32, carried by a support 33. The Sleeve 81 has secured thereto, a spur gear which may be driven from any suitable source of power` and will rotate the sleeve. As the sleeve 31 isrotated, the sleeve 30 will also be rotated by reason of the keyed or splined connection thereto.

The rear end of the sleeve 30 bears against a bali-thrust bearing' 38, which will take up the end thrust as the drill is moved forwardly cylinder 46 and is secured at its other end to the casing' or support 33.

rlhe rear end of the hollow piston rodv 40 has mounted therein a ball bearing 51 lor supjiorting; the rear end portion ot the spindle or rod on which the hand wheel 16 is secured.

When air or other motive lluid is adn'iitted to one end or the other ot the cylinder 46, the sleeve '30 and parts associated therewith will beA moved toward or away from the work, the drill being' rotated at the same time Aby means of the splined connection between the sleeve 30 and the rotating sleeve 31. The admission of motive luid to one end of the cylinder and the exhaust oit the tluid from the other end of the cylinder is controlled by valve mechanism, which in turn is automatically controlled to reverse the longitudinal movement ot the tool after the tool has moved a predetermined distance into the work.

Valve mechanism.

'and also ports 66 and 67 which serve alternately as inlet and exhaust ports. -ttor instance, in Fig. 2'the port 67 communicates with theair vent and therefore servingl as an exhaust port. ylhe port 66 is receiving` motive AHuid trom chambers 6.1 and 62 in a manner hereinafter explained and thus serves as an intake port. rllhe chamber 62 communicates with the chamber 61 through passages 70, 71 and 72.

The chamber 61 is provided with vent ports 73, 74 and 7 5 and with a pair of intake ports 76 and 77. Each. of the chambers 61 and 62 has mounteditherein a slide valve 80 having a plurality of cylindrical. portions or heads 81, 82, 83 and 84, which are connected by reduced portions 85, 86 and S7.

lt `will be noted that when the cylindrical portions or heads are disposed in the cham ber between two ports, communication between these ports will be blocked, whereas when the reduced portions are so disposed, communication will be open to these ports.

rlhe ports66 and 67 which communicate with the chamber 62are connected by cones, if/orreee duits 90 and 91 to the ports 48 and 47 which communicate with the ends ot the cylinder 46.

its shown in Fig. 3, the ports 66 and 67 have connected thereto, conduits 92 and 93. rlhe conduit 92 receives motive fluid, preterably con'ipressed air from a source ot supply, and the conduit 93 communicates with the conduit 92 through a valve casing` 94. rllhe passage through this valve is controlled by a valve 95. ln actual practice the conduits 92 and 93 will also be connected to a similar valve mechanism at the other end ot the machine tor operatingl a tool for drilling the opposite end ot the crank shaft or other work mounted in the machine.

the valve mounted in the chamber 61 has secured to the end thereof, aspindle or rod 100, slidably mounted in and extending through an extension or plug` 101 secured to the valve casing,` 60.. rl`he rod has termed therein, a. pair ot annular grooves 102, and 103 adapted to he engaged by a ball 104, which is mounted in a plug 105 threaded into the extension 101. The ball 104 is spring pressed in one direction by a spring' 106, one end ot which is engaged by a screw 107 which is secured in adjusted position by a lock nut 108. lt will be evident that when the rod 100 is adjusted to a position in which the ball will register with the groove that the hall will be spring pressed in the groove, and will form a nonpositive stop for holding,l the rod in adjusted position. The grooves are so formed that when the slide valve in the chamber is positioned in its extreme lett position, as shown in Fig. 3, the ball `104 will seat in the groove 103. Wv hen the valve is adjusted to the right hand end of the valve chamber, as shown in Fig. 2, the hall will seat in the `groove 102.

Fig. 2 illustrates the valve mechanism adjuster to a position in which the motive tluid or on'ipressed air which enters the chamber 61 through the port 76, passes through the port 71 and out ot' the chamher 62 through the port 66 and thus through the conduit 90 into the lett hand end oi the cylinder The iluid will therefore move the piston head 43 to the right and will thus move the drill in a direction toward and into trie work. rllhe motive fluid from the port 7 6 will also pass through the passage 7 2 into the right hand end ot' the chamber 62 and will thus tend to torce the valve in the chamber 62 to the lett and maintain the valve in this position until the valve mechanism is automatically shifted in a manner hereinafter described. lli/'hen the valve adjusted as in Fig. 2 and air is passing` into cylinder 46 through conduit 90, air will leave the other end ot the cyiinde through conduit. 91 and. will pass through port 67, chamber 62 and out through vent 65.

Sti

Then the drill has moved a predetermined distance into the work, the valve mechanism will be automati :ally shifted in a manner which will now be described so that the motive fluid will be introduced into the right hand end of the cylinder 11G and will cause the cylinder to withdraw from the work.

Valve control meollo/dwz.

In the particular i'orm of the invent-ion shown, the valve control mechanism comprises a. rod 110, slidably mounted in I,Q juides 111 and 112. The rod 110 is preferably made in two sections 113 and 114;, the end 113 beingl threaded into a. coupling, 11:3 and the end ot the section 11sL being slidably mounted in the opposite end ot this coupling; A knul-led nut 116 is mounted on the end ot the rod 111; in a recess 117 termed in the coupling. This nut is engaged by a pin 11S which is spring;` pressed into eng-agement with e. nut by means of a` spring 119, confined by a screw 120. lt will thus be seen that by rotating` the nut 116, the length ot the rod termed by the sections 113 and 11st can be varied to suit requirements.

The left hand end ol the rod in Fig. 1 pivotally connected at 120 to a lever 121 which is pivoted at one end 122 to a bracket 123 lined to the frame of the machine. At its opposite end the lever 121 is biturcated as shown at 121 and the biturcated end receives a. pin 1241 carried by the collar 125 which is clamped to the rear end or lett hand end (Fig. 1) of the piston rod 10.

The opposite end ot the rod 1.10 or ot the section 111 thereoi' is pivoted at 130 to the upper end of a lever 131 which in turn is pivoted intermediate at its ends at 132 to a lever 133. The lever 133 is pivoted at its lower end at 131 between a pair of lugs 135 disposed at the iront end ot the extension 101. The lever 133 extends upwardly belvond the rodsection 114 and has an oii'set end 13G adapted to act as a teeler and to engage the work 13T as the rod 110 or the rod sections 113 or 114 are moved longitudinally with the movement of the tool.

The lower end ot the lever 13.1 has secured thereto a plate 1110 which is positioned as shown in Figs. 2 and 3 to eng-age the outer end of the rod 100. In order to retain the plate in engagement with the rod at all times, a spring 141 is secured to the lever 131 below its pivot 132 and to the lower end portion of the lever 133. This spring' tends to swing' the lever 131 in a clockwise direction and retains the plate 111-() in engagement with the outer end ot the rod 100.

From the foregoing description of the mounting of the rod 110, it will be seen that the parallel link support for this rod and the connection to the piston l() will `rive the 'teeler 136 the same amount ot' movement as the movement of the drill. As the drill moves into the work, the upper end or teeler 136 olf the lever 133 will engage the, work and when this takes place, the pivot 132 which has been swinging with the levers 131 and 133 will become lixed and further movement oit' the piston and ot the drill will cause the rod il() to swine,l the lever 131 about its pivotin a clockwise direction, thus moving the slide valve in the chamber G1 from the position shown in Fig'. 2 to the position shown in Fi 3. lllhen the slide valve in the chambcr 61 is thus shifted the motive tluid will pass from the port T6 through the passage 7l into the chamber (l2 and out oiC this chamber through the port 67 and conduit 91 into the cylinder through the port Lli". The motive tluid will also pass trom the port 7G through the chamber G1 and through the passage TO into the lelt hand end ot the chamber (i2. thus maintaining the slide valve in the chamber 62 against the plug G3 at the riiiht hand end ot this chamber. The lett hand end ot the cylinder L16 will communicate with the atmosphere through conduit- 90. port (36 and vent (ill.

llilhen the piston head 13 has been moved to the back or lett hand end of the cylinder "t3, the drill will remain retracted until the operator presses upwardly on the valve 95, thus admit-tiner air from the constant source ol supply through the y'alve chamber lll and through the conduit 93 to the let't hand end ot the *alve chamber 61. This will cause the slide valve in this chamber to be shifted to the right or to the position shown in Fig. 2, whereupon the compressed air will be ad mitted to the rear or lett hand end of' the cylinder 116 and will move the tool toward the work and into drilling` position.

The proportions of the levers connecting the piston i3 to the teeler end 133 are such that. the partl 13G is advanced or retracted equally with the drill point and maintains the same position relative thereto. Thus the drill always enters tho work a predetermined distance before engagement of the 'leeler with the worl: and this entrance ol the drill into the wort: remains constant. regardless of any reasonable variation in the total length ot the worl. The Vfurther advance movement oit the drill during' reversal ot' the valve mechanism is also substantially constant so that the total depth of the holes remains substantially unchanged by variations in length of work.

General operation.

From the 'foregoing description it will be seen that a machine has been provided whereby the d rilling of center holes in crank shafts or other structures can be automatically aceonnilished, after the machine has been started in operation. Furthermore, by reason of the control mechanism described, the center holes will be accurately and uniformly lll() drilled to a desired depth Without any care or attention on the part of the operator. By adjusting the length ot the control rod, the depth to Whiclrthe drill Will penetrate the worl can be regulated as desired.

Although one specific term has been particularl)7 shown and described, it will he unda, 'stood that the invention is capable of nfiodilication and that changes in construction and arrangement the va'e'ious co-operatingg,` parts may be made Without dep from the scope ot the invention as ei:- pressed inv the claims.

What l claim is o l. A drilling' machine comprising a tor?. means to rotate said toch fluid 'pres re 'feedinn' means to produce relative inovemenf` bctvveen said tool and the Werl; in opposite directienm and automaticallj.7 operable control mechanism adapted for abutment with the vvorlt for reversing operation oi 'd fluid pressure means.

2. A drilling machine comprising; a 'rotatable drill, means to rotate the drill, pneumatic tee-ding mechanism tor moving` the drill lon- `gitudinally into the ivorlt and for with( ra.` ing' the drill from the Work, and automatically operable control mechanisn'i i'i'iovable iv'h said drill, to abut the Work for cans pneumatic mechanism to reverse th`r tudinal n'iovement ot the drill when the drill .has moved a predetermined distance into the Work,

3. drilling` machine coin-raising a rotatable drilh means to rotate the drill, 'feeding mechanisn'i iormoving the crill longitudinally into the AWort and for withdrawing the drill from the n'orli, and automaticalh/ operable control mechanism movable With said drill, to abut the Work 'for causing said mechanism to reverse the longitudinz-Ll movement et' the drill when the drill has moved a predetermined distance into the Worlt.

Lil. il.V drillingl machine comprising a rotatable drill, means to rotate the drilh pneumatic 'feeding' mechanism for moving; the drill longitudinally into the ivorlr and for Withdrawing the drill Yfrom the worl and anton'irticallv `operable control mechanism 'lor causi said pneumatic mechanism to reverse the it gitudinal movement. ot the drill when the drill has moved a predetermined .di nice into the Work, said control mechanism includ-ing a 'feeler movable with said drill to abut the Work.

5. A drilling machine comprising a rotatable drill, means to rotate the drill, pneun'iatic feeding' mechanism tor moving' the drill longitudinally into and out oi the vorlt, vai mechanism for controlling said pneumatic n'iechanism, and means including/ ij a :ieeler n'iovable Wi th the drill and adapted `to abut the Work for controlling said valve mechanism.

6. A drilling machinecomprising a rotatifrodees able drill, means to rotate the drill7 pneumatic te 'ling mechanism for moving the drill longitudinally into and out ol' the Worx, valve mechanism for controlling` said pneumatic mechanisun and means includingl a i'eeler movable with the drill ano adapted to abut the ivorlr for controlling' said valve mechau nism their-bj7 to withdraiv the drill trom tue Work agiter the drill has moved .into the Work a predetermined distance.

's'. fr machi ot the character described comprising a rotatable tool, means to rotate said tool, feeding mechanism tor automatiinoving' the tool into and out oli the valve r "uanifmi 'for centrolliug the movement ot the tool n` and r. i

a rod, movab with the tro! s' i to abut the n'orlt and opcrativelv to said valve mechanism for shitting; the valve anc cruising` the tool to withdranY trom the Work aiter he 'tool has moved a )redetermined distance into the vorl.

Q. A machine thev character described iprising` e. rotatable tool. a piston connected thereto, a cjf'lii'ider surround" c the sten, pnemnz-i-tic means tor actuat ngi' said iston to cause said tool to move longitudinallvl into and out oit the Werl:` and automatic control means includum` :i member movable With said Itool to abut the Work ,tor revers-ing; the longitudinal movement et the piston `When the tool has moved predetermined distance into the Work.

9. t machine ot the characte described comprising' a rotatable tool, a piston connected thereto, a cylinder surrounding the piston, pneumatic means for actuating said piston to cause said tool to move longitudivally into and out of the Work7 and automatic control means including' a member adapted to abut the Work and valve mechanism controlled by said member for reversing the lonqitndinal movement of the piston when the tool has moved a pJ-'edetermined dista ,c into the vvorl.

l0. il. machine o'li the character described comprising' a rotatable tool, a piston connected thereto, a cylinder rrounding the piston, pneun'ritic means tor actuatingl said piston to cause said tool to move lonQiti-idinallyv into and out ot the Work, valve mech- :mism for ,entren ng the passage ot motive tluid to the cylinder for actuating the piston and automatically operable adjustable means synchronized with said tool, tor controlling' said valve mechanism and adapted to abut the' Work, thereby to reverse the movement .ot the piston and tool .when the tool has moved a predetern'iined dista ce into thc Work.

1l. A drilling machine comprising? a rotatable drill, means to rotate said drill, pneumatic feeding' mechanism for moving-7 the drill longitudinally into and out et the Work, val-ve mechanisml for controlling' said pneu- Sli arried by the teeler for automatically controlling said valve mechanism.

13. A drillingl machine comprising` a rotatable drill, pneumatic mechanism for moving the drill longitudinally into and out otl the ivorlt, valve mechanism for controlling said pneumatic mechanism, a rod movable with the tool as the tool is mov 1d longitudie nally, a teeler adapted to abut the work, and a valve actuating lever connected to the rod and to the feeler and adapted to actuate the valve mechanism subsequent to the engagement ot the work by the 'teeleiz ld. A drilling machine comprising a rotatable drill, pneumatic mechanism tor moving the drill longitudinally into and out ot the Work, valve mechanism tor controlling said pneumatic mechanism, a rod movable with the tool as the tool is moved longitudinally, a Jeeler engageablc ivith the Work, and a valve actuating lever pivotally connected to the rod and to the tceler and adapted to actu-ate the valve mechanism subsequent to the engagement of the work by the 'teclea l5. A drilling machine comprising a rotatable drill, pneumatic mechanism tor moving the drill longitudinally into and out et the work, valve mechanism tor cimtrolling said pneumatic mechanism, a rod movable with the tool as the tool is moved longitudinallyI` a t'celcr engi'ageablc with the Work, and a. valve actuating lever pivotally connected to the rod and to the teelcr and adapted to actuate the 'alve mechanism subsequent to the engagement ot' the ivork by the feeler in a manner to shi'lt the valve mechanism and reverse the movement ot the tool.

iti. il drilling machim` comprising a rotatable drill, means to rotate said drill` puenmatic l'ccding mechanism `tor moving the drill l.:- K 'tudinally into and out ot' the work. valve iin-rchanism for controlling said pneumatic mechanism. means including a feeler movable ivith said drill and adapted to abut the work tor controlling said valve n'icchanisn'i, and means for adjusting said feeler to vary the engagement ot' the teeler ivith the vvork to determine the extent ot drill movement into the work.

17. A drilling machine comprising a rotatable drill, means to rotate said drill, pneumatic feeding mechanism for moving the drill longitudinally into and out of the Work, valve mechanism for controlling said pneumatic mechanism, means including a t'eeler movable with said drill and adapted to abut thc work lor controlling said valve mechanism, and means for adjusting said feeler to vary the position of the eelcr relative to the position ot' the tool to determine the extent oit drill movement into the work.

1S. A drilling machine comprising a rotatable drill, pneumatic mechanism for moving the drill longitudinally into and out of the work, valve mechanism` for controlling said pneumatic mechanism, said valve mechanism comprising a valve casing havinga pair of valves therein for controlling the passage of mot-ive Afluid therethrough to said pneumatic mechanism, and means including a member adapted to abut the work tor automatically shitting one el said valves when the tool has moved a predetermined distance into the work.

19. A drilling machine comprising a rotatable drill, pneumatic mechanism for moving the drill longitudinally into and out ot' the work, valve mechanism for controlling said pneumatic mechanism, said valve mechanism comprising a valve casing having a pair et valves therein for controlling the passage of motive fluid therethrough to said pneumatic mechanism, means for auton'iatically shitting one et said valves when the tool has moved a predetermined distance into the work, and a manually operable control valve Jor admitting motive fluid to shift said last named valve in the opposite direction.

20. A drilling machine comprising a rotatable drill, pneumatic mechanism for moving the drill longitudinally into and out of thc Work, valve mechanism lt'or controlling said pncmnatic mechanism, said valve mechanism comprising a valve casing, havingl a pair ot valves therein for controlling the passage ot motive fluid therethrough to said pneumatic mechanism, and a manually controlled valve for admitting motive fluid to shift one et said valves to initiate the iorward movement ot said tool into the work.

21. A drillingmachine comprising a rotatable drill, pneumatic mechanism for `moving the drill longitudinally into and out oit the work, valve mechanism tor controlling said pneumatic mechanism, said valve mechanism comprising a valve casing having a fluid actuated Valve and a mechanically actuated valve therein for controlling the passage ot' motive fluid therethrough to said pneumatic mechanism, and means, including a member adapted to abut the Work, for automatically shifting said mechanically actuated valve when the tool has moved a predetermined distance into the Werl: thereby to perw mit the motive fluid to actuate Said fluid actuated valve.

22; A .drilling machine comprieing` a rotatable drill, pl'leu'rnati'c mechaniem for moving the' drill longitudinally into and out of the work' valve mechanism for controllingl Said pneumatic mechanism,l said valve mechanism comprising a valve casini having a pair oil? Valves thereinjl'or ccntrollingl the passage of motive liuid therethrough to Said piieumatic mechanism, one of Said valves being `controlled hyA action or the motive fluid -thereagainstj the Oth'e'rof said valves heling meclialiizlly cortrolled,v and means, includ'inpl a member adapted to ahnt the werk,` for automatically shifting said mechanically con'- trolled Valve' TCh'e'n the tool has moved a pre'- det-ermined distance into the ivm-li, and a manually operable ccntrol vulve for admitting,Y motivevfluid to shirt said mechanically actuated Valve in the opposite direction.

23. A drilling machine comprising a rotatable drill, pneumatic mechanism for moving the drill longitudinally into and out of the work,` valve mechanism for controlling` said pneumatic mechanism, said Valve mechaniem comprisingv a valve casing having` a fluid actuated valve and a mechanically actuated Valve therein -for cont-rolling the passieve of motive fluid therethrough to said pneumatic mechanism, and means including a member engageahle with the werk tor automatically shiitii'ig said mechanically actuated valve when the tool hee4 moved a predetermined distance' inte the Work ther-ehiv7 te permit the motive fluid te hafctuate said fluid actuated Valve, and a inanuallyA controlled Valve for admitting,-` motive fluid to ehit said mechanically actuated valve ink a' reverse direction to initiate the forward movenient of eaid tool into the n'orlr.

ln testimony whereof l have hereunto all fixed my signature. 

